States Of Matter

Question 1

States of matter

Answer 1

Solid liquid gas

Question 2

In solids, the particles:

Answer 2

• have a regular arrangement
• very closed together
• vibrate around fixed positions

Question 3

In liquids, the particles:

Answer 3

• have a random arrangement
• are close together
• flow around each other

Question 4

In gases, the particles:

Answer 4

• have a random arrangement
• are much further apart
• move very quickly in all directions

Question 5

When a substance changes state:

Answer 5

• the particles themselves stay the same
• the way the particles are arranged changes
• the way the particles move changes

Question 6

A pure substance will:

Answer 6

• Melt and freeze at one specific temp, MELTING POINT

- Boil and condense at one specific temp, BOILING POINT

Question 7

What does the amount of energy required for a substance to change state depends on ?

Answer 7

The amount of energy required to overcome the forces of attraction between particles

Question 8

The stronger the forces of attraction:

Answer 8

• the greater the amount of energy needed to overcome them

- the higher the melting and boiling point will be

Question 9

Examples of substances that have high melting points

Answer 9

-ionic compounds, metals and giant covalent structures

Question 10

Limitations of the particle model

Answer 10

• the forces between the particles
• the volume (although small) of the particles
• the space between particles

Question 11

In substances that contain small molecules

Answer 11

• the bonds within the molecules are strong covalent bonds
• the forces of attraction between the molecules are much weaker
• only a little energy is needed to overcome the forces between molecules, so melting and boiling points are relatively low